Auth bypass in Canonical Lxd
CVE-2026-12411
Broken Access Control in the devLXDInstancePatchHandler component of Canonical LXD allows an untrusted guest to mount, read, and overwrite another guest's custom storage volume via a crafted device PATCH request over /dev/lxd when security.devlxd.management.volumes is enabled.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Canonical Lxd — versions 6.6
Weakness classification (CWE)
References
- github.com/canonical/lxd/security/advisories/GHSA-hhf9-qw4v-72xp (Exploit, vendor-advisory, vdb-entry, Vendor Advisory)
- github.com/canonical/lxd/pull/18585 (Patch, patch, Issue Tracking)
Frequently asked questions
- What is CVE-2026-12411?
- CVE-2026-12411 is a high-severity vulnerability in Canonical Lxd, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.4/10. Published 2026-06-26.
- How severe is CVE-2026-12411?
- High severity. CVSS v3 base score is 8.4 out of 10.